𝔖 Bobbio Scriptorium
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Enhanced granular magnetoresistance due to ferromagnetic layers

✍ Scribed by J. Balogh; M. Csontos; D. Kaptás; G. Mihály

Book ID
104166107
Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
154 KB
Volume
126
Category
Article
ISSN
0038-1098

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✦ Synopsis

Giant magnetoresistance (GMR) of sequentially evaporated Fe -Ag structures has been investigated. Direct experimental evidence is given, showing that inserting ferromagnetic layers into a granular structure significantly enhances the magnetoresistance. The increase in the GMR effect is attributed to spin polarization effects. The large enhancement (up to more than a fourfold value) and the linear variation of the GMR in low magnetic fields are explained by scattering of the spin polarized conduction electrons on paramagnetic grains.

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## Abstract Low‐temperature charge‐carrier transport in simple magnetoresistive nanodevices, consisted of narrow constrictions of submicron width in the epitaxial layer of a ferromagnetic (Ga,Mn)As semiconductor, has been investigated and correlated with magnetic properties of the layer. The device